% slitherlink 420 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/420.a.htm
slitherlink
medium-
10 10
3.1..1.123
.32.32..22
3..2...3..
.2....2...
.22132..32
3.....121.
3.3.....3.
.2..3..22.
.....2..3.
3........2
